<!DOCTYPE html>
<html>
<body>

<p>要用到的图片：</p>
<img src="http://www.w3school.com.cn/i/lamp.gif" id="lamp"/>
<p>Canvas:</p>

<button onclick="draw('repeat')">Repeat</button>
<button onclick="draw('repeat-x')">Repeat-x</button>
<button onclick="draw('repeat-y')">Repeat-y</button>
<button onclick="draw('no-repeat')">No-repeat</button>

<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
    Your browser does not support the HTML5 canvas tag.
</canvas>

<script type="text/javascript">
    function draw(direction) {
        var c = document.getElementById("myCanvas");
        var ctx = c.getContext("2d");
        ctx.clearRect(0, 0, c.width, c.height);
        var img = document.getElementById("lamp")
        var pat = ctx.createPattern(img, direction);
        ctx.rect(0, 0, 150, 100);
        ctx.fillStyle = pat;
        ctx.fill();
    }
</script>

</body>
</html>
